6.4.            553

  .      
   ,    .

          -
     VPI,   VCI,       -
      ,   
   VCI,  VPI  .   
   .

        -
 ,    . 6.30.     
 ISDN        Q.2931,
       .    
   Q.931  Q.933 ( ),    , ,
,        
  .  Q.2931    -
    SSCOP,    
 Q.2931   .   ,  SSCOP  
 AAL5,      SSCOP   
         SSCOP   .

     Q.2931           UN1
3.1,      UN13.0     Q.93B. -  -
 Q.2931  Q.93B    UNI 3.0  UNI 3.1  .
 UNI 4.0    UNI 3.1,        ,  
 UNI 3.1._______________________________________

 ,     Q.2931, 
 ()  .

 Q.2931      
-- (point-to-point)  -- (point-to-multipoint). 
    ,    ,
         , 
    .    ---
   ,     .
         , 
          
.      ,    
  . ,    , 
  ,  ,   -  (
 ),    .

  Q.2931,    -
  ,      ,    -
 Q.933,      frame relay,  
 , , .

       20- . 
    ,   ISO 7498. 
       .164,   1 
 AFI, 8   IDI     .164 (15  -
 ),   11   DSP (Domain Specific Part) -
  .